Remove use of deprecated MessageLoop methods in chrome/.

chrome/browser/chromeos/policy/display_rotation_default_handler_browsertest.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chromeos/policy/display_rotation_default_handler.h"
 
 #include <stdint.h>
 
 #include <memory>
 
 #include "ash/display/display_manager.h"
 #include "ash/shell.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/location.h"
 #include "base/macros.h"
-#include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
+#include "base/single_thread_task_runner.h"
+#include "base/threading/thread_task_runner_handle.h"
 #include "chrome/browser/chromeos/login/ui/login_display_host.h"
 #include "chrome/browser/chromeos/policy/device_policy_builder.h"
 #include "chrome/browser/chromeos/policy/device_policy_cros_browser_test.h"
 #include "chrome/browser/chromeos/policy/proto/chrome_device_policy.pb.h"
 #include "chrome/browser/chromeos/settings/cros_settings.h"
 #include "chrome/browser/lifetime/application_lifetime.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "chromeos/chromeos_switches.h"
 #include "chromeos/dbus/cryptohome_client.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
@@ skipping 54 matching lines @@
 
   void SetUpInProcessBrowserTestFixture() override {
     InstallOwnerKey();
     MarkAsEnterpriseOwned();
     DevicePolicyCrosBrowserTest::SetUpInProcessBrowserTestFixture();
   }
 
   void TearDownOnMainThread() override {
     // If the login display is still showing, exit gracefully.
     if (chromeos::LoginDisplayHost::default_host()) {
-      base::MessageLoop::current()->PostTask(FROM_HERE,
-                                             base::Bind(&chrome::AttemptExit));
+      base::ThreadTaskRunnerHandle::Get()->PostTask(
+          FROM_HERE, base::Bind(&chrome::AttemptExit));
       content::RunMessageLoop();
     }
   }
 
  protected:
   void SetPolicy(int rotation) {
     em::ChromeDeviceSettingsProto& proto(device_policy()->payload());
     proto.mutable_display_rotation_default()->set_display_rotation_default(
         static_cast<em::DisplayRotationDefaultProto::Rotation>(rotation));
     RefreshPolicyAndWaitUntilDeviceSettingsUpdated();
@@ skipping 219 matching lines @@
 }
 
 INSTANTIATE_TEST_CASE_P(PolicyDisplayRotationDefault,
                         DisplayRotationBootTest,
                         testing::Values(display::Display::ROTATE_0,
                                         display::Display::ROTATE_90,
                                         display::Display::ROTATE_180,
                                         display::Display::ROTATE_270));
 
 }  // namespace policy